The Collaborative International Dictionary of English v.0.48:

Harangue \Ha*rangue"\, v. i. [imp. & p. p. Harangued
   (h[.a]*r[a^]ngd"); p. pr. & vb. n. Haranguing.] [Cf. F.
   haranguer, It. aringare.]
   To make an harangue; to declaim.
   [1913 Webster]